A tree or trees.
[Latin arbor, tree.]
An arboretum is a tree garden; arboriculture is the culture of trees, especially for ornamental or scientific purposes. An arbour (US arbor) is a garden alcove shaded by trees or plants trained over a framework. Adjectives include arborescent, something tree-like in growth or appearance, such as a crystal, and arboreal, living in trees, or of the nature of trees. An arborization in anatomy is a fine branching structure at the end of a nerve fibre, like the branches of a tree.